Self-regulating stove.



No. 794,900.. PATENT'BD JULY 1a, 1905. R. E. o. sUoH1ER. SELF REGULATING' s'frov. APPLIOATION FILED DECLSL 1897.

. Attorney VENTOR oZerEQaS' yf UNITED STATES Patented July 18, 1905.

PATENT OFFICE.

SELF-REGULATING STOVE.

SPECIFICATION forming part of Letters Patent No. 794,900, dated July 18, 1905.

Application filed December 3l, 1897. Serial No. 665,099.

T0 1J/Z whom t www concern:

Be it known that I, ROBERT EDUARD OTTO SUCHIEE, a subject of the German Emperor, residing at Freiburg, in Breisgau, in the country of Baden, Germany, have invented a Self- Regulating Stove, of which the following is a specification.

My invention relates to stoves, and articularly to that class wherein a metal ro is employed which through its expansion or contraction, according to the degree of temperature, is adapted to actuate a damper device to regulate the admission of air to the grate through the medium of suitable intermediate mechanism; and the object of the invention is to rovide novel means or devices for ac comp ishing the purpose stated and to maintain as far as practicable a normal degree of temperature.

To this end the invention consists in the improved stove and stove mechanism embodying an indicator and regulating device, all as hereinafter described, and particularly pointed out in the claim.

In the drawings accompanying and forming a part of this specification, Figure 1 is a central llongitudinal section of a stove embodying my improvements. Fig. 2 is a front view of the same, partly in section. Fig. 3 is a transverse section.

At a is the opening for supply of fuel, at b another opening for lighting the stove and emptying out the ashes. Both of these shut air-tight.

c shows the section of a sifting-grate.

d is the ash-pan; e, the opening for escape of smoke.

The metal rod (or pipe) made of alu minium, serves for the automatic regulating of the fire. While lhave mentioned aluminium as being preferable, it is obvious that numerous other metals or metal alloys may be employed with more or less satisfaction. The metal rod is firmly secured at' the top by the screw g to a piece of brass h, secured against vertical displacement, so that when it eX- pands from the heat of the stove it only does so along its length downward. The 'brass 71, has in front a horizontal Groove, in which moves the pin k of the disk which is placedv 'of the eccentric pin 7c.

eccentrically on the `flat disk-like end of a rod it'. This rod is on the top of the stove hori- Zontal to the regulator. The front end of e' has a pointer m, which moves on a dial n, and by means of a short catch projecting from the back of it this pointer may be fixed in a hole on the dial n at any point desired. Turning the pointer moves the rod t' t' on its axis, (the rod being journaled in its supports l 1,) and this operates to move the regulating-rod f f in the desired direction through the action The regulator terminates at the bottom of the stove in a blunt point or cone. As soon as it expands downward this cone presses on the shorter arm o of the two-armed lever 0 p. By this the lever is pressed and the damper g, hinged at r, rises to close the opening s, through which opening alone air can reach the lire. (See arrows in Fig. 2.)

The arm p of the double-armed lever o p is provided with a iiXed pin u', which when said arm is raised engages Aa curved upper end of a lever a, pivoted at r, and causes it and the door (l, which is rigid with said lever, to move and close the draft-opening s. When the arm p is lowered, the pin a, acting on the lower portion of the lever u, will depress the same, moving the lever and the door q, thus opening the draft-opening s.

Vhen the stove is cold, the regulatoryp is so adjusted that it barely touches arm 0, leaving arm p in its lowermost position, with door g open, so that air can freely enter. A 'lire being kindled, the heating of the regulator causes it to expand and press down upon arm o, thereby wholly or partially closing the door g in the manner described, whereby the admission of air through the door is regulated according to the degree of heat developed and the consequent expansion and contraction of the regulator. If through the action of the regulator the heat ceases to be so intense, the regulator cools and draws back from 0, by which process the curved arm u of the lever p falls upon the hinged portion of damper g and opens the same. This goes on repeatedly, but always less and less in degree, until the intensity of heat corresponds with the length of regulator. The

IOO

A III- stove then gives out a perfectly even Warmth, While the fire does not go out, but burns on. If the pointer is put at ICold, the pin lc pushes the regulator so far down that the damper remains continuously shut, and thus the fire goes out. If the pointer is set at Warm," the pin 7c pulls the regulator as far back from o as possible. It follows then from its position that in order to make its end press on the arm of the lever and cause door g to shut opening s it requires a much higher temperature Athan in the first case or normal point, so that the pointer may be set according to the varying degrees of outside temperature at Warm or NormaL and the rodf regulates the fire automatically.

In practice I may employ any of the usual means for supplying a draft of fresh air to the space above the grate to prevent an eXplosion of coal-gases which may accumulate therein, but prefer for this purpose the provision shown in the drawings, consisting of the bent pipe t, arranged as shown. The air arriving through this channel passes directly into the chimney e, carrying away at the same time any gaseswhich may be evolved.

In a stove, the combination with a vertically-placed expansible regulator-bar, a coun` terweighted damper-door, connections between the door and regulator whereby the vertical contraction and expansion of the regulator operates to open the door or permit it to close, a shaft horizontally journaled in the top of the stove, a ointer fixed on said shaft, a dial, means or securing the pointer at any point on the dial, a disk on the rear end of the shaft, a block in the rear of the shaft provided with a horizontal groove in its front face, a crank-pin on the disk entering said groove, and means for adjustably securing the upper end of the regulator to said block, substantially as and for the purposes set forth.

ROBERT EDUARD OTT() SUCHIER. Witnesses:

FRANZ CONRAD, EDMUND JOHN TREBLE. 

